Improvement in puddling-furnaces



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SAMUEL MCLAUGHLIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELFAND BENJAMIN R. OASKEY, OF SAME PLACE.

Letters Patent N 0. 100,30S, dated March, 1, 1870.

IMPROVEMENT IN -IP'IJ'DDLING-IEURNAIIS.

The Schedule referred to in these Letters Patent and making part of thesame I, SAMUEL MCLAUGHLIN, of the city and county of Philadelphia, andState of Pennsylvania, have invented certain Improvements in theConstruction of Puddling-Ifurnaces, of 'which the following is aspecification.

The nature of my invent-ion consists in so shaping the exterior ironplates which inclose the furnace and hearth, that they conform to theshape ofthe hearth,

and thereby make a'great saving in the amount of fire-brick and materialused in its construction, whereby also the lining of fire-brick can bemade thicker and more durable on the jamh of the door; also in themauner of securing the door-frame to the said iron plates.

In the drawing accompanying this specification- Figure 1 is a plan of myfurnace. Figure 2 is alongitudinal section. The furnace with thegrate-bars beneath is shown at A' Tlie hearth where thepuddling isperformed at B. C is the chimney. I

The exterior of the furnace is made of cast-ironplates D D' D" 'D'bolted together by anges and bolts, as shown at g.

Puddling-furnaccs as now made have the plates D D' in one` straightline, the size and shape of the lireplace and hearth being made byfilling in with brick plates D swell outward, either by a curveor inangular lines, so as to conform to the shape of the hearth, which isusually of an elliptical form.

The interior side of the plates D D' are then lined with a course offire-brick, which is brought up with an even thickness of about nineinches close to the door-frame H.

The plates D" gradually converge to the chimney, which is the narrowestpart of thefurnace.

The door-frame H is constructed with a flange, h,

fitting against a corresponding flange in the plates D', so thatthe'interior of the door-frame is iush with the interior of thecast-iron plates D', thus rendering it much less liable to.be burnedaway, and the fire-brick much more. easily fit-ted. This door-traine Ilis curved outward, as shown for a similar object.

By this mode of construction a uniform thickness of fire-brick, Ii, maybe used both front and back of the hearth, costing less in construction,being more durable, and more economical in fuel.

WhatI claim as my invention, and desire to secure by Lettersv Patent, is

l. rPhe casing plates D D', also the door-frame H, swelled or curvedoutward, so as to conform tothe shape of the hearth, in the mannerherein shown and i described.

2. 'Ihedoorframe H, rabbeted 0r flanged'as shown, so as to bring theinside flush on aline with the inside ot' the casing plates D',substantially as described.

v SAMUEL MCLAUGHLIN.

Witnesses EDWD. BROWN, J osEPH RABY.

